1/* 2 * vivid-kthread-out.h - video/vbi output thread support functions. 3 * 4 * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved. 5 * 6 * This program is free software; you may redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; version 2 of the License. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 11 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 12 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 13 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 14 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 15 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 16 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 17 * SOFTWARE. 18 */ 19 20#include <linux/module.h> 21#include <linux/errno.h> 22#include <linux/kernel.h> 23#include <linux/init.h> 24#include <linux/sched.h> 25#include <linux/slab.h> 26#include <linux/font.h> 27#include <linux/mutex.h> 28#include <linux/videodev2.h> 29#include <linux/kthread.h> 30#include <linux/freezer.h> 31#include <linux/random.h> 32#include <linux/v4l2-dv-timings.h> 33#include <asm/div64.h> 34#include <media/videobuf2-vmalloc.h> 35#include <media/v4l2-dv-timings.h> 36#include <media/v4l2-ioctl.h> 37#include <media/v4l2-fh.h> 38#include <media/v4l2-event.h> 39 40#include "vivid-core.h" 41#include "vivid-vid-common.h" 42#include "vivid-vid-cap.h" 43#include "vivid-vid-out.h" 44#include "vivid-radio-common.h" 45#include "vivid-radio-rx.h" 46#include "vivid-radio-tx.h" 47#include "vivid-sdr-cap.h" 48#include "vivid-vbi-cap.h" 49#include "vivid-vbi-out.h" 50#include "vivid-osd.h" 51#include "vivid-ctrls.h" 52#include "vivid-kthread-out.h" 53 54static void vivid_thread_vid_out_tick(struct vivid_dev *dev) 55{ 56 struct vivid_buffer *vid_out_buf = NULL; 57 struct vivid_buffer *vbi_out_buf = NULL; 58 59 dprintk(dev, 1, "Video Output Thread Tick\n"); 60 61 /* Drop a certain percentage of buffers. */ 62 if (dev->perc_dropped_buffers && 63 prandom_u32_max(100) < dev->perc_dropped_buffers) 64 return; 65 66 spin_lock(&dev->slock); 67 /* 68 * Only dequeue buffer if there is at least one more pending. 69 * This makes video loopback possible. 70 */ 71 if (!list_empty(&dev->vid_out_active) && 72 !list_is_singular(&dev->vid_out_active)) { 73 vid_out_buf = list_entry(dev->vid_out_active.next, 74 struct vivid_buffer, list); 75 list_del(&vid_out_buf->list); 76 } 77 if (!list_empty(&dev->vbi_out_active) && 78 (dev->field_out != V4L2_FIELD_ALTERNATE || 79 (dev->vbi_out_seq_count & 1))) { 80 vbi_out_buf = list_entry(dev->vbi_out_active.next, 81 struct vivid_buffer, list); 82 list_del(&vbi_out_buf->list); 83 } 84 spin_unlock(&dev->slock); 85 86 if (!vid_out_buf && !vbi_out_buf) 87 return; 88 89 if (vid_out_buf) { 90 vid_out_buf->vb.v4l2_buf.sequence = dev->vid_out_seq_count; 91 if (dev->field_out == V4L2_FIELD_ALTERNATE) { 92 /* 93 * The sequence counter counts frames, not fields. So divide 94 * by two. 95 */ 96 vid_out_buf->vb.v4l2_buf.sequence /= 2; 97 } 98 v4l2_get_timestamp(&vid_out_buf->vb.v4l2_buf.timestamp); 99 vid_out_buf->vb.v4l2_buf.timestamp.tv_sec += dev->time_wrap_offset; 100 vb2_buffer_done(&vid_out_buf->vb, dev->dqbuf_error ? 101 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); 102 dprintk(dev, 2, "vid_out buffer %d done\n", 103 vid_out_buf->vb.v4l2_buf.index); 104 } 105 106 if (vbi_out_buf) { 107 if (dev->stream_sliced_vbi_out) 108 vivid_sliced_vbi_out_process(dev, vbi_out_buf); 109 110 vbi_out_buf->vb.v4l2_buf.sequence = dev->vbi_out_seq_count; 111 v4l2_get_timestamp(&vbi_out_buf->vb.v4l2_buf.timestamp); 112 vbi_out_buf->vb.v4l2_buf.timestamp.tv_sec += dev->time_wrap_offset; 113 vb2_buffer_done(&vbi_out_buf->vb, dev->dqbuf_error ? 114 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE); 115 dprintk(dev, 2, "vbi_out buffer %d done\n", 116 vbi_out_buf->vb.v4l2_buf.index); 117 } 118 dev->dqbuf_error = false; 119} 120 121static int vivid_thread_vid_out(void *data) 122{ 123 struct vivid_dev *dev = data; 124 u64 numerators_since_start; 125 u64 buffers_since_start; 126 u64 next_jiffies_since_start; 127 unsigned long jiffies_since_start; 128 unsigned long cur_jiffies; 129 unsigned wait_jiffies; 130 unsigned numerator; 131 unsigned denominator; 132 133 dprintk(dev, 1, "Video Output Thread Start\n"); 134 135 set_freezable(); 136 137 /* Resets frame counters */ 138 dev->out_seq_offset = 0; 139 if (dev->seq_wrap) 140 dev->out_seq_count = 0xffffff80U; 141 dev->jiffies_vid_out = jiffies; 142 dev->vid_out_seq_start = dev->vbi_out_seq_start = 0; 143 dev->out_seq_resync = false; 144 145 for (;;) { 146 try_to_freeze(); 147 if (kthread_should_stop()) 148 break; 149 150 mutex_lock(&dev->mutex); 151 cur_jiffies = jiffies; 152 if (dev->out_seq_resync) { 153 dev->jiffies_vid_out = cur_jiffies; 154 dev->out_seq_offset = dev->out_seq_count + 1; 155 dev->out_seq_count = 0; 156 dev->out_seq_resync = false; 157 } 158 numerator = dev->timeperframe_vid_out.numerator; 159 denominator = dev->timeperframe_vid_out.denominator; 160 161 if (dev->field_out == V4L2_FIELD_ALTERNATE) 162 denominator *= 2; 163 164 /* Calculate the number of jiffies since we started streaming */ 165 jiffies_since_start = cur_jiffies - dev->jiffies_vid_out; 166 /* Get the number of buffers streamed since the start */ 167 buffers_since_start = (u64)jiffies_since_start * denominator + 168 (HZ * numerator) / 2; 169 do_div(buffers_since_start, HZ * numerator); 170 171 /* 172 * After more than 0xf0000000 (rounded down to a multiple of 173 * 'jiffies-per-day' to ease jiffies_to_msecs calculation) 174 * jiffies have passed since we started streaming reset the 175 * counters and keep track of the sequence offset. 176 */ 177 if (jiffies_since_start > JIFFIES_RESYNC) { 178 dev->jiffies_vid_out = cur_jiffies; 179 dev->out_seq_offset = buffers_since_start; 180 buffers_since_start = 0; 181 } 182 dev->out_seq_count = buffers_since_start + dev->out_seq_offset; 183 dev->vid_out_seq_count = dev->out_seq_count - dev->vid_out_seq_start; 184 dev->vbi_out_seq_count = dev->out_seq_count - dev->vbi_out_seq_start; 185 186 vivid_thread_vid_out_tick(dev); 187 mutex_unlock(&dev->mutex); 188 189 /* 190 * Calculate the number of 'numerators' streamed since we started, 191 * not including the current buffer. 192 */ 193 numerators_since_start = buffers_since_start * numerator; 194 195 /* And the number of jiffies since we started */ 196 jiffies_since_start = jiffies - dev->jiffies_vid_out; 197 198 /* Increase by the 'numerator' of one buffer */ 199 numerators_since_start += numerator; 200 /* 201 * Calculate when that next buffer is supposed to start 202 * in jiffies since we started streaming. 203 */ 204 next_jiffies_since_start = numerators_since_start * HZ + 205 denominator / 2; 206 do_div(next_jiffies_since_start, denominator); 207 /* If it is in the past, then just schedule asap */ 208 if (next_jiffies_since_start < jiffies_since_start) 209 next_jiffies_since_start = jiffies_since_start; 210 211 wait_jiffies = next_jiffies_since_start - jiffies_since_start; 212 schedule_timeout_interruptible(wait_jiffies ? wait_jiffies : 1); 213 } 214 dprintk(dev, 1, "Video Output Thread End\n"); 215 return 0; 216} 217 218static void vivid_grab_controls(struct vivid_dev *dev, bool grab) 219{ 220 v4l2_ctrl_grab(dev->ctrl_has_crop_out, grab); 221 v4l2_ctrl_grab(dev->ctrl_has_compose_out, grab); 222 v4l2_ctrl_grab(dev->ctrl_has_scaler_out, grab); 223 v4l2_ctrl_grab(dev->ctrl_tx_mode, grab); 224 v4l2_ctrl_grab(dev->ctrl_tx_rgb_range, grab); 225} 226 227int vivid_start_generating_vid_out(struct vivid_dev *dev, bool *pstreaming) 228{ 229 dprintk(dev, 1, "%s\n", __func__); 230 231 if (dev->kthread_vid_out) { 232 u32 seq_count = dev->out_seq_count + dev->seq_wrap * 128; 233 234 if (pstreaming == &dev->vid_out_streaming) 235 dev->vid_out_seq_start = seq_count; 236 else 237 dev->vbi_out_seq_start = seq_count; 238 *pstreaming = true; 239 return 0; 240 } 241 242 /* Resets frame counters */ 243 dev->jiffies_vid_out = jiffies; 244 dev->vid_out_seq_start = dev->seq_wrap * 128; 245 dev->vbi_out_seq_start = dev->seq_wrap * 128; 246 247 dev->kthread_vid_out = kthread_run(vivid_thread_vid_out, dev, 248 "%s-vid-out", dev->v4l2_dev.name); 249 250 if (IS_ERR(dev->kthread_vid_out)) { 251 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n"); 252 return PTR_ERR(dev->kthread_vid_out); 253 } 254 *pstreaming = true; 255 vivid_grab_controls(dev, true); 256 257 dprintk(dev, 1, "returning from %s\n", __func__); 258 return 0; 259} 260 261void vivid_stop_generating_vid_out(struct vivid_dev *dev, bool *pstreaming) 262{ 263 dprintk(dev, 1, "%s\n", __func__); 264 265 if (dev->kthread_vid_out == NULL) 266 return; 267 268 *pstreaming = false; 269 if (pstreaming == &dev->vid_out_streaming) { 270 /* Release all active buffers */ 271 while (!list_empty(&dev->vid_out_active)) { 272 struct vivid_buffer *buf; 273 274 buf = list_entry(dev->vid_out_active.next, 275 struct vivid_buffer, list); 276 list_del(&buf->list); 277 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); 278 dprintk(dev, 2, "vid_out buffer %d done\n", 279 buf->vb.v4l2_buf.index); 280 } 281 } 282 283 if (pstreaming == &dev->vbi_out_streaming) { 284 while (!list_empty(&dev->vbi_out_active)) { 285 struct vivid_buffer *buf; 286 287 buf = list_entry(dev->vbi_out_active.next, 288 struct vivid_buffer, list); 289 list_del(&buf->list); 290 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); 291 dprintk(dev, 2, "vbi_out buffer %d done\n", 292 buf->vb.v4l2_buf.index); 293 } 294 } 295 296 if (dev->vid_out_streaming || dev->vbi_out_streaming) 297 return; 298 299 /* shutdown control thread */ 300 vivid_grab_controls(dev, false); 301 mutex_unlock(&dev->mutex); 302 kthread_stop(dev->kthread_vid_out); 303 dev->kthread_vid_out = NULL; 304 mutex_lock(&dev->mutex); 305} 306